Abstract
The influence of parental genotype on the chromosomal pairing relationships within the wheat and rye genomes of triticale (× Triticosecale Wittmack) was investigated. Nullisomic 3A/tetrasomic 3B and nullisomic 5B/tetrasomic 5D plants of the cultivar Chinese Sping wheat were pollinated with inbred strains of rye (Secale cereale L.), the latter being selected on the basis of their average chiasma frequency. The level of chiasma number in the F1 hybrids was found to be influenced by the genotype of both the wheat and rye parents. Homeologous pairing was increased in the wheat × rye hybrids produced from inbred rye parents that exhibited high chiasma frequencies. However, this relationship was modified depending upon the genotype of the wheat parent. Increased dosage of chromosome 3B of wheat was found to increase chiasma frequency. These findings suggest that the genetic constitution of a rye parent and its specific combining ability with a certain wheat genotype markedly affects meiotic behavior of triticale.
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